+dnl libconfig (highly recommended)
+PKG_CHECK_MODULES([LIBCONFIG], [libconfig],
+ [AC_SUBST([LIBCONFIG_CFLAGS])
+ AC_SUBST([LIBCONFIG_LIBS])
+ AC_DEFINE([HAVE_LIBCONFIG],[1],[libconfig found at compile time.])
+ ],
+ [AC_MSG_WARN([libconfig not found, some features will be disabled])])
+AM_CONDITIONAL([HAVE_LIBCONFIG],[test "x$LIBCONFIG_LIBS" != "x"])
+